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History & Geology

The Birimian Greenstone Belts of West Africa

The country we were to visit was Burkina Faso, a small country about the same size of my home state of Nevada with about 10 times more people. The second day I was in Africa, we went out to the goldfields for the first time.

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Benches and Fossil Placers


Unfortunately for us mortal humans, we have a poor perspective on geologic time. When we look at a landscape such as a stream valley, we see it only in two, or at the most, three dimensions. We have poor comprehension of the valley’s fourth and most important dimension—time.

Critical Metals: Copper


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Gold of the Iditarod Mining District, Alaska


It was the middle of winter and the valley was covered in snow, making prospecting a matter of sinking shafts in the ground.

Electrum: Gold and Silver Together


...if you are out prospecting and find something that looks very much like a nugget but has an odd greenish-gray cast to it, don’t be too quick to simply toss it aside as junk.

The Potholes—California’s Oldest Known Mining District


Every time we prospected here we found gold, sometimes some really coarse flakes, but no large nuggets (yet).

Placer Gold Deposits of New Mexico


While a large number of locations have yielded some placer gold, most of the state’s placer production has come from a few productive districts.

Why Is The Gold On Bedrock—Or Why Is It Not?


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